1939 - 9n cutout wiring

SDE

Well-known Member
I have looked at a wiring diagram by JMOR, for the 9n. The wiring diagram shows the wire connecting to the top of the cutout, to be from the battery. I have a cutout that I removed from a 2n. It has Ford stamped on it, and the B is on the lower front of the cover, not the top. It seems that it would be mounted so that Ford is not upside down. I assume that this "B" terminal would be for the wire that connects from the battery to the amp gauge and resistor block and then to the cutout. Do I wire it as shown in the diagram or do I put the battery wire to the B terminal? Or can it be wired either way?
TY
SDE
 
Regardless of how you mount it,..... the battery terminal of cut out connects to center terminal of resistor block and the gen terminal of cut out connects to generator armature....as shown in diagram.
 
Forget about the logo -it's the terminals that matter. Do you have the original manuals? JMOR's PICTIGRAMS show all the ways to wire these N's in pretty good detail. Is your 6V generator a 1-Wire/3-Brush Unit?

FORD 9N (AFTER S/N12500) & 2N WIRING DIAGRAMS:
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QWaC1aah.jpg

FORD 9N-10505-B CUTOUT:
U2VXum1h.jpg

Tim *PloughNman* Daley(MI)
 
I did not realize that the cutouts would be different, from one to another. Here is a picture of the one I am going to install on the 9N. The B is at the bottom. I did not check on how it was wired on the 2n because the wiring was not correct and why duplicate a messed up system, But I will look it over to see where the wire from the B terminal attached to.
The generator is a 3 brush, one wire generator from a 2n and it has 9n on the front of the mounting flange and has the tension arm attached with two 1/4 x 28" to the body.
TY
SDE
a280564.jpg
 
I can not see the bottom edge of cut out cover/can. Is it possible that someone has installed the cover backwards?
 
The Battery terminal should be completely isolated from the case, whereas, the arm/Gen terminal should show an internal connection (small resistance) to the case.
 
Both terminals look the same to me. Both have insulators, that look the same. This a picture of the back side and the B terminal is at the bottom again.
TY
a280582.jpg
 
(quoted from post at 10:20:55 09/21/18) Both terminals look the same to me. Both have insulators, that look the same. This a picture of the back side and the B terminal is at the bottom again.
TY
a280582.jpg
'm not speaking of insulators. Use an Ohmmeter from either terminal to case. Open circuit or not?
 
It appears that this cutout should be wired just like your diagram shows and that the B is actually the gen. post.
TY
SDE
 
The '9N-10138' mounting plate is not the generator part number, only the flange/bracket number. It may even have the 10139 casting number on it. Ford Tractor N-Series generator assemblies are "XN-10000" and the units were never marked. Some have date codes -FORD script logo, may have a star symbol, with a code like 'T12' meaning year = 1939, month = December. The Ford part prefix determines the module it was first used on. Thus, the first 9N generator, p/n 9N-10000, was the small barrel, 2-Wire/2-Brush 'B' Circuit design that used the square Voltage Regulator, p/n 9N-10505. By early 1940 the generator was revised to a 1-Wire/3-Brush, 'A' Circuit design unit, now p/n 9N-10000-B, and now use the round-can cutout circuit, now p/n 9N-10505-B. The earlier 9N generator was now designated by the letter 'A' suffix. Part suffix defines which revision it is. You have the correct generator, a 2N-10000 if you have the belt tensioning device bolted to the barrel. It is virtually the same as the 9N-10000-C generator in all other aspects. The 9N-1000-C unit had no tensioning device, but a kit was offered that included the tensioning unit which had a steel band to fasten it to the barrel with. You can find all this information in the MPC's -you just have to know how to interpret the data. Most FORD parts had the logo stamped on the them so your cutout APPEARS to be an original. Many of today's aftermarket parts can be made all over the place as far as internal design and manufactured mostly in Cheena. There is no QC in China and you can only use the FORD logo by paying a licensing fee to lease the name. There's only one manufacturer who does that, Dennis Carpenter. It matters where you buy parts from. Go by the wiring diagrams and to what JMOR tells you. I'd verify the internal wiring of your cutout before connecting it. I think it may have had the housing cover flipped around 180?.

Tim *PloughNman* Daley(MI)
 

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